期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 3, 页码 819-826出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta07818k
关键词
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资金
- Fundamental R&D Program for Technology of World Premier Materials - Ministry of Knowledge Economy, Republic of Korea
- National Research Foundation of Korea (NRF) Grant - Korea Government (MEST) [2010-0029244]
Lithium-sulfur (Li-S) batteries are attractive due to a high theoretical energy density and low sulfur cost. However, they have critical drawbacks such as drastic capacity fading during cycling, especially under high current density conditions. We report a suitable carbon matrix based on partially unzipped multi-walled carbon nanotubes (UZ.CNTs), which have favorable properties compared to multi-walled carbon nanotubes (MWCNTs) and fully unzipped nanoribbons (UZ.NRs). Partially unzipped walls of MWCNTs lead to increased surface area and pore volume with a retained electron conduction pathway. This also provides accessible inner pores as a stable reservoir for polysulfides. This reservoir is decorated with newly introduced oxygen containing functional groups, and affords a synergistic effect of shortening the depth that electrons penetrate and interacting with polysulfides for high-performance Li-S batteries. The synergistic effect is revealed by Monte Carlo simulations. The resulting partially unzipped MWCNT sulfur composite delivers 707.5 mA h g(-1) at the initial discharge and retains 570.4 mA h g(-1) after 200 cycles even at a high current rate of 5C (8375 mA g(-1)).
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